Microbiology of Soils
Most soil protozoa are flagellates or amoebas, having their dominant mode of nitrogen as

all of these
ingestion of mold
ingestion of fungi
ingestion of bacteria

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Microbiology of Soils
A heterocyst is

a cell that carries out oxygenic photosynthesis
a type of spore
the progenitor of cyanobacterial vegetative cells
a terminally differentiated cell that fixes nitrogen

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Microbiology of Soils
Nitrogen oxidation (nitrification)refers to the

None of these
conversion of ammonium ions into nitrates through the activities of certain bacteria.
sulfur is oxidized to the sulfate form through Thiobacillus bacteria
changing of atmospheric nitrogen (N2) to nitrogen compounds

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